| Stefan Bosch | be278c1 | 2020-07-10 19:07:30 +0200 | [diff] [blame] | 1 | Binding for Nexell s5pxx18 pin cotroller |
| 2 | ======================================== |
| 3 | |
| 4 | Nexell's ARM bases SoC's integrates a GPIO and Pin mux/config hardware |
| 5 | controller. It controls the input/output settings on the available pads/pins |
| 6 | and also provides ability to multiplex and configure the output of various |
| 7 | on-chip controllers onto these pads. |
| 8 | |
| 9 | Please refer to pinctrl-bindings.txt in this directory for details of the |
| 10 | common pinctrl bindings used by client devices, including the meaning of the |
| 11 | phrase "pin configuration node". |
| 12 | |
| 13 | |
| 14 | Required properties: |
| 15 | - compatible: "nexell,s5pxx18-pinctrl" |
| 16 | - reg: should be register base and length as documented in the datasheet |
| 17 | - interrupts: interrupt specifier for the controller over gpio and alive pins |
| 18 | |
| 19 | Example: |
| 20 | pinctrl_0: pinctrl@c0010000 { |
| 21 | compatible = "nexell,s5pxx18-pinctrl"; |
| 22 | reg = <0xc0010000 0xf000>; |
| 23 | u-boot,dm-pre-reloc; |
| 24 | }; |
| 25 | |
| 26 | Nexell's pin configuration nodes act as a container for an arbitrary number of |
| 27 | subnodes. Each of these subnodes represents some desired configuration for a |
| 28 | pin, a group, or a list of pins or groups. This configuration can include the |
| 29 | mux function to select on those pin(s)/group(s), and various pin configuration |
| 30 | parameters. |
| 31 | |
| 32 | Child nodes must be set at least one of the following settings: |
| 33 | - pins = Select pins for using this function. |
| 34 | - pin-function = Select the function for use in a selected pin. |
| 35 | - pin-pull = Pull up/down configuration. |
| 36 | - pin-strength = Drive strength configuration. |
| 37 | |
| 38 | Valid values for nexell,pins are: |
| 39 | "gpioX-N" : X in {A,B,C,D,E}, N in {0-31} |
| 40 | Valid values for nexell,pin-function are: |
| 41 | "N" : N in {0-3}. |
| 42 | This setting means that the value is different for each pin. |
| 43 | Please refer to datasheet. |
| 44 | Valid values for nexell,pin-pull are: |
| 45 | "N" : 0 - Down, 1 - Up, 2 - Off |
| 46 | Valid values for nexell,pin-strength are: |
| 47 | "N" : 0,1,2,3 |
| 48 | |
| 49 | |
| 50 | Example: |
| 51 | - pin settings |
| 52 | mmc0_clk: mmc0-clk { |
| 53 | pins = "gpioa-29"; |
| 54 | pin-function = <1>; |
| 55 | pin-pull = <2>; |
| 56 | pin-strength = <2>; |
| 57 | }; |
| 58 | |
| 59 | mmc0_cmd: mmc0-cmd { |
| 60 | pins = "gpioa-31"; |
| 61 | pin-function = <1>; |
| 62 | pin-pull = <2>; |
| 63 | pin-strength = <1>; |
| 64 | }; |
| 65 | |
| 66 | mmc0_bus4: mmc0-bus-width4 { |
| 67 | pins = "gpiob-1, gpiob-3, gpiob-5, gpiob-7"; |
| 68 | pin-function = <1>; |
| 69 | pin-pull = <2>; |
| 70 | pin-strength = <1>; |
| 71 | }; |
| 72 | |
| 73 | - used by client devices |
| 74 | mmc0:mmc@... { |
| 75 | pinctrl-names = "default"; |
| 76 | pinctrl-0 = <&mmc0_clk>, <&mmc0_cmd>, <&mmc0_bus4>; |
| 77 | ... |
| 78 | }; |